Phoenix Flash Flooding
Heavy Monsoon Storms Trigger Flash Flooding and Closures Across Metro Phoenix
Anonymous
Key Points
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Phoenix’s free cooling centers are open to everyone without identification, and residents needing transportation to a cooling center or other heat-relief site can call 2-1-1 daily from 9 a.m. to 7 p.m.
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Maricopa County’s 2025 report found that about half of heat-related deaths occurred on days when the National Weather Service classified the heat risk as moderate; the county also recorded a heat-related death every day during a 44-day period from June 18 through July 31, 2024.
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Phoenix’s 2026 Heat Response Plan includes volunteers distributing heat-safety information and cold water at Camelback Mountain, Piestewa Peak and South Mountain every Saturday from May 1 through Sept. 30, from 7 to 10 a.m.
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A truck left in a flooded Bashas’ parking lot at Higley and Brown roads was moved after the storm and, according to its owner, was still running normally: “It runs fine.”
Heavy monsoon storms drenched the Phoenix area on September 16, dropping nearly four inches of rain in some locations within six hours and triggering flash-flood warnings across Maricopa County. Arizona Central reported that flooding turned roads and parking lots into rivers in Mesa, Scottsdale, and Phoenix, forcing Mesa Community College to close its Red Mountain campus and prompting a ground stop at Phoenix Sky Harbor International Airport.
Emergency responders worked through the night assisting stranded motorists as water receded. Mod Bee noted that the storm caused power outages and damage across the Valley. Lingering showers are expected to end Thursday morning, with mostly sunny skies and a high near 93 degrees before extreme heat returns and temperatures climb toward 100 on Friday.
Four Inches Falls in Six Hours Across the Valley
The storm system unleashed torrential rain across metro Phoenix with extraordinary intensity. Mod Bee reported that areas of east Mesa and north Scottsdale received over three inches of rain, while some locations got nearly four inches in just six hours. The deluge overwhelmed drainage systems and turned normally dry washes into raging waterways.
Colleges Close and Airports Ground Flights
The flooding forced immediate shutdowns at key facilities across Phoenix. Arizona Central reported that Mesa Community College shut down its Red Mountain campus due to water damage and safety concerns. Meanwhile, Phoenix Sky Harbor International Airport halted operations temporarily as floodwaters threatened the runway area and surrounding infrastructure.
Heat-Relief Centers Ready as Temperatures Spike Again
As rain ends and extreme heat returns, Phoenix is activating its cooling centers for vulnerable residents. The city's free cooling centers welcome everyone without requiring identification. Residents needing transportation to a cooling center can call 2-1-1 daily from 9 a.m. to 7 p.m. for assistance. Phoenix's 2026 Heat Response Plan also includes volunteers distributing water and safety information at three mountain trailheads every Saturday from May through September, 7 to 10 a.m..
Heat threats in Phoenix are often underestimated. Maricopa County's 2025 report found that about half of heat-related deaths occurred on days when the National Weather Service classified the risk as moderate. During a 44-day period from June 18 through July 31, 2024, the county recorded a heat-related death every single day.
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